Development of Tools for Prediction and Reduction of Jet and System Noise
|Cooperation:||Volvo Aero Corp.|
|Start of project:||December 1999|
|End of project:||July 2004|
Acoustic noise emission has in recent years become an increasingly important factor in the design of new commercial aero-engines due to stricter and stricter international regulations. Although modern high-bypass ratio fan-jet engines already have significantly reduced jet noise emissions as compared to older engines, further reductions will be necessary in order to meet the new demands foreseen for the next decade. At take-off conditions both fan noise from the intake and jet/core/turbine noise from the exhaust are important, whereas at approach and landing conditions exhaust core noise is often the dominating component. Since VAC (Volvo Aero Corp.) is involved with the design and manufacturing of vital parts of the exhaust system of several commercial engines (turbine exhaust casings, etc), increased knowledge in the area of exhaust noise is desirable. Such knowledge, together with reliable computational tools, would help the designer to optimise between performance, noise emissions, life expectancy and maintenance. New noise reduction technologies such as overlapping deswirl vanes and/or surface treatment (acoustic liners) may also be investigated and evaluated for exhaust systems in a relatively inexpensive manner.
The overall objective of this proposed task is to model the generation and propagation of acoustic noise in aero-engine exhaust systems. The focus of the work will be on modern commerial engines of high-bypass ratio fan-jet type.
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